IWI Japanese Proofreading Tool is an AI-powered proofreading service from Intelligent Wave Inc., a company specializing in information security and payment systems. The tool uses proprietary AI that understands context to check for unnatural semantic connections, kanji conversion errors, and particle appropriateness based on surrounding text.
A standout feature is built-in compliance with Japan’s Public Document Writing Guidelines (Cabinet Secretary Notice, January 2022), covering modern kana usage, standard kanji recommendations, and okurigana rules. This makes the tool particularly suited for government agencies, municipalities, and organizations that produce formal public-facing documents.
The paid tier adds custom glossary registration for specialized terminology, team rule sharing to standardize notation across organizations, and direct text extraction from Word, Excel, PowerPoint, and PDF files. Uploaded files are not stored on servers, and input text is not used for AI training in the paid version. A Microsoft Word add-in lets users access proofreading directly within their documents.